Fatigue and Fracture Behavior of Al6061-B4C Aluminium Matrix Composites

In the present day engineering design and development activities many Scientists, Researchers and Engineers are striving hard to develop new and better engineering materials, which accomplishes high strength, low weight and energy efficient materials since the problems of environment and energy are major threshold areas. The development of new materials is growing day by day to replace the conventional materials in aerospace, marine engineering, automobile engineering industries etc., Hence, composite materials are found to be an alternative. A variety of metals and their alloys such as Aluminum, Magnesium and Titanium are comprehensively used as matrix materials. Among these Aluminium alloys have been used extensively, because of their excellent strength, low density, corrosion resistance and toughness. Similarly, many researchers have attempted to develop aluminum based metal matrix composites using different reinforcements such as SiC, Al2O3, B4C, TiC, TiO2, B4C etc., are added to the matrix to get required MMC’s. Among these reinforcements, B4C emerged as an exceptional reinforcement due to its high strength to density ratio, possesses high hardness and avoid the formation of interfacial reaction products with aluminum. Hence, in this paper attempts are made to fabricate Al 6061-3, 6, 9 and 12 wt.% B4C metal matrix composites by stir casting process to study fatigue life and fracture toughness as per ASTM standards. It is evident that fatigue strength and fracture toughness of the composites were enhanced with the addition of the wt.% of the reinforcement.

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Fabrication and Investigation on Properties of TiC Reinforced Al7075 Metal Matrix Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.592-594.349 ◽

2014 ◽

Vol 592-594 ◽

pp. 349-353 ◽

Cited By ~ 8

Author(s):

V. Ramakoteswara Rao ◽

N. Ramanaiah ◽

M.M.M. Sarcar

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Chemical Reactivity ◽

Density Ratio ◽

High Hardness ◽

High Strength ◽

Stir Casting ◽

Matrix Composites ◽

Matrix Metal ◽

Aa 7075

Aluminium alloy (AA7075) is largely used in various fields of transport applications, including marine, automotive and aviation and aerospace due to their high strength-to-density ratio. The present work deals with the influence of TiC on the mechanical behavior of AA 7075 composites. TiC is particularly attractive as it offers high hardness and elastic modulus, low density, good wettability yet low chemical reactivity with aluminium melts. The aluminium metal matrix composites (AMMCs) are produced as AA 7075 matrix metal and TiC particulates of an average size of 2µm as reinforced particles through stir casting, Magnesium added to the melt to overcome the wetting problem between TiC and liquid AA7075 metal. AMMCs are produced in different %weight of TiC ranging between 2 to 10%.These composites are characterized with optical, SEM and EDS analysis in as-cast condition and T6condition and hardness are predicted using macro vickers hardness tester. The test results showed increasing hardness of composites compared with matrix (AA7075) because of the presence of the increased reinforced material (TiC)

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Nanocrystalline Diamond Coated Tool Performance in Machining of LM6 Aluminium Alloy/Alumina MMC

Volume 2: Materials; Biomanufacturing; Properties, Applications and Systems; Sustainable Manufacturing ◽

10.1115/msec2015-9409 ◽

2015 ◽

Author(s):

Ramasubramanian Kannan ◽

Arunachalam Narayanaperumal ◽

Mamidanna Sri Ramachandra Rao

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Weight Ratio ◽

High Hardness ◽

High Strength ◽

Matrix Composites ◽

Aerospace Applications ◽

Coated Tools ◽

Nano Crystalline ◽

Improved Performance

Aluminium based metal matrix composites (MMC) gain its importance in automotive and aerospace applications due to their high strength to low weight ratio, which leads to reduced fuel consumption and improved performance. However the usage of MMC is limited due to its poor machinability. The presence of hard reinforcing particles in MMC makes these materials difficult to machine. A cutting tool with high hardness and low coefficient of friction is required for machining this MMC material effectively. In this paper a comparative study on machinability of different coated tools on LM6 aluminum alloy/alumina MMC are conducted and presented. Experimental results on tool wear, cutting force and surface finish indicate that nano-crystalline diamond coated tools (NCD) outperform the other commercially available coated tools for machining this metal matrix composites.

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Synthesis of Metal Matrix Composites through Stir Casting Process – a Review

Mechanics and Mechanical Engineering ◽

10.2478/mme-2018-0029 ◽

2020 ◽

Vol 22 (1) ◽

pp. 357-370 ◽

Cited By ~ 4

Author(s):

S. Sakthivelu ◽

P. P. Sethusundaram ◽

M. Meignanamoorthy ◽

M. Ravichandran

Keyword(s):

Mechanical Properties ◽

Metal Matrix Composites ◽

Metal Matrix ◽

Weight Ratio ◽

High Strength ◽

Casting Process ◽

Stir Casting ◽

Matrix Composites ◽

Pure Metals ◽

Engineering Materials

AbstractMetal is the one of the important material in engineering materials because of their high strength to weight ratio. However the pure metals cannot be used as engineering materials due to their ductile property. So, to improve their mechanical properties, some of the high strength materials (not metals) were added as reinforcement to improve the mechanical properties of pure metals and the newly developed material is called as metal matrix composites. At present, Aluminium, Copper, Magnesium, Titanium and Iron have been used as matrix materials and materials like TiC, SiC, B4C, WC, Cr3 C, TiO2, ZrO2, Gr, MoS2 and Si3N4 have been used as reinforcements. There are many processing techniques to fabricate metal matrix composites namely stir casting, ultra-sonic assisted casting, compo-casting, rheo casting, powder metallurgy technique, etc,. Among these, stir casting process is the most suitable and economical method to fabricate the metal matrix composites. In this article, an effort has been made to review the work of various researchers to fabricate metal matrix composites through stir casting process.

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Wettability in Metal Matrix Composites

Metals ◽

10.3390/met11071034 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1034

Author(s):

Massoud Malaki ◽

Alireza Fadaei Tehrani ◽

Behzad Niroumand ◽

Manoj Gupta

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Aluminum Matrix ◽

Interfacial Strength ◽

High Strength ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Metal Matrix Nanocomposites ◽

Aerospace Applications ◽

Matrix Nanocomposites

Metal matrix composites (MMCs) have been developed in response to the enormous demand for special industrial materials and structures for automotive and aerospace applications, wherein both high-strength and light weight are simultaneously required. The most common, inexpensive route to fabricate MMCs or metal matrix nanocomposites (MMNCs) is based on casting, wherein reinforcements like nanoceramics, -carbides, -nitrides, elements or carbon allotropes are added to molten metal matrices; however, most of the mentioned reinforcements, especially those with nanosized reinforcing particles, have usually poor wettability with serious drawbacks like particle agglomerations and therefore diminished mechanical strength is almost always expected. Many research efforts have been made to enhance the affinity between the mating surfaces. The aim in this paper is to critically review and comprehensively discuss those approaches/routes commonly employed to boost wetting conditions at reinforcement-matrix interfaces. Particular attention is paid to aluminum matrix composites owing to the interest in lightweight materials and the need to enhance the mechanical properties like strength, wear, or creep resistance. It is believed that effective treatment(s) may enormously affect the wetting and interfacial strength.

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Tensile and fatigue properties of fiber-reinforced metal matrix composites Cf/5056Al

Composites and Advanced Materials ◽

10.1177/2633366x20929712 ◽

2021 ◽

Vol 30 ◽

pp. 2633366X2092971

Author(s):

Ying Ba ◽

Shu Sun

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

High Strength ◽

Longitudinal Direction ◽

Fatigue Properties ◽

Matrix Composites ◽

Weak Interface ◽

Fiber Reinforced ◽

Alloy Matrix ◽

Medium Strength

Fiber-reinforced metal matrix composites have mechanical properties highly dependent on directions, possessing high strength and fatigue resistance in fiber longitudinal direction achieved by weak interface bonding. However, the disadvantage of weak interface combination is the reduction of transversal performances. In this article, tensile and fatigue properties of carbon fiber-reinforced 5056 aluminum alloy matrix (Cf/5056Al) composite under the condition of medium-strength interface combination are carried out. The fatigue damage mechanisms of Cf/5056Al composite under tension–tension and tension–compression loads are not the same, but the fatigue life curves are close, which may be the result of the medium-strength interface combination.

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CFD Simulation and Experimental Validation of Solidification of Metal Matrix Composites (MMC) in the Presence of Cooled Fibers

Heat Transfer, Volume 2 ◽

10.1115/imece2004-60290 ◽

2004 ◽

Author(s):

R. S. Amano ◽

J. Xie ◽

E. K. Lee ◽

P. K. Rohatgi

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Cfd Simulation ◽

Applied Pressure ◽

Casting Process ◽

Processing Parameters ◽

Matrix Composites ◽

Primary Alpha ◽

Parametric Studies ◽

Solidification Of Metal

A new experimental configuration for the casting of metal matrix composites (MMCs) using Al-4.5 wt pct Cu have been used to obtain finer microstructures around the fiber reinforcement. The new configuration allows the fibers to be extended out the mold and cooled by a heat sink. By doing so, the solidification can be made more rapid, and more primary alpha-aluminum phase can be formed on the surface of the fibers. It is believed that this can lead to improvement in the properties of the composite. CFD simulation of the solidification of Al-4.5 wt pct Cu in the casting process has been carried out by using commercial CFD code. Parametric studies on the effects of different processing parameters on solidification time have been simulated using the CFD code. These parameters include, but are not limited to, the pouring temperature of the liquid melt, sink temperature, fiber length extended out of the mold, the mold initial temperature, fiber conductivity, applied pressure, and fiber bundle diameter. Selected simulation results are compared with the available experimental data obtained from the UWM Center for Composites.

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